Note 5 - Goodwill and Intangible Assets (Detail) - Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Amortizable intangible assets:
Gross carrying value	272,546	275,965
Accumulated Amortization	(136,323)	(123,069)
Net carrying value	136,223	152,896
Minimum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months
Minimum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	45 months	45 months
Minimum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	24 months	24 months
Maximum [Member] | Customer Relationships [Member]
Amortizable intangible assets:
Estimated useful lives	60 months	60 months
Maximum [Member] | Trade Names [Member]
Amortizable intangible assets:
Estimated useful lives	84 months	84 months
Maximum [Member] | Unpatented Technology [Member]
Amortizable intangible assets:
Estimated useful lives	40 months	40 months
Customer Relationships [Member]
Amortizable intangible assets:
Gross carrying value	202,186	204,699
Accumulated Amortization	(100,126)	(90,040)
Net carrying value	102,060	114,659
Trade Names [Member]
Amortizable intangible assets:
Gross carrying value	59,876	60,620
Accumulated Amortization	(27,103)	(24,413)
Net carrying value	32,773	36,207
Noncompete Agreements [Member]
Amortizable intangible assets:
Estimated useful lives	36 months	36 months
Gross carrying value	3,102	3,116
Accumulated Amortization	(2,451)	(2,313)
Net carrying value	651	803
Unpatented Technology [Member]
Amortizable intangible assets:
Gross carrying value	7,382	7,530
Accumulated Amortization	(6,643)	(6,303)
Net carrying value	739	1,227